Dismissed by unpublished PER CURIAM opinion.

Unpublished opinions are not binding precedent in this circuit.

Stephen Mark Hause appeals from the magistrate judge’s text orders denying his motions for a preliminary injunction and for the appointment of an expert. He also moves for injunctive relief on appeal. His civil proceeding is still pending in district court. We dismiss.

An order denying a preliminary injunction is an immediately appealable interlocutory order. 28 U.S.C. § 1292(a)(1) (2012). However, during the pendency of this appeal, Hause was released from custody. Claims for injunctive relief become moot when a prisoner is no longer subjected to the conditions about which he complains. Williams v. Griffin, 952 F.2d 820, 823 (4th Cir. 1991). Therefore, Hause’s appeal of the district court’s denial of preliminary injunctive relief is moot.

As to Hause’s appeal of the magistrate judge’s denial of his motion for an expert, we may exercise jurisdiction only over final orders, 28 U.S.C. § 1291 (2006), and certain interlocutory and collateral orders, 28 U.S.C. § 1292 (2006); Fed.R.Civ.P. 54(b); Cohen v. Beneficial Indus. Loan Corp., 337 U.S. 541, 545, 69 S.Ct. 1221, 93 L.Ed. 1528 (1949). “[A]n order is final if it ends the litigation on the merits and leaves nothing for the court to do but execute the judgment.” Penn-Am. Ins. Co. v. Mapp, 521 F.3d 290, 294 (4th Cir. 2008) (internal citations and quotations omitted). This litigation remains pending in the district court. Thus, the district court’s order denying the motion for an expert is neither a final order nor an appealable interlocutory or collateral order. See id. at 294-95. Accordingly, this portion of the appeal is dismissed as interlocutory.

*259 Based on the foregoing, we dismiss Hause’s appeal and deny his motion for injunctive relief pending appeal. We dispense with oral argument because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

DISMISSED.